12543920756 has 12 divisors (see below), whose sum is σ = 21953107680. Its totient is φ = 6271604280.

The previous prime is 12543920731. The next prime is 12543920771. The reversal of 12543920756 is 65702934521.

It is a super-2 number, since 2×12543920756² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161 + ... + 158391.

It is an arithmetic number, because the mean of its divisors is an integer number (1829425640).

Almost surely, 2^12543920756 is an apocalyptic number.

It is an amenable number.

12543920756 is a deficient number, since it is larger than the sum of its proper divisors (9409186924).

12543920756 is a wasteful number, since it uses less digits than its factorization.

12543920756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178054 (or 178052 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 12543920756 in words is "twelve billion, five hundred forty-three million, nine hundred twenty thousand, seven hundred fifty-six".